Can anyone explain why in the following code, where btnCancel1 is a
Button inside the itemTemplate of the formview, the first call to
change the text of the button, in the Page_Load sub, works fine, but
the second call, in the bookFormView_ItemUpdated sub, throws an
exception (Object reference not set to an instance of an object)? And
if you know why, can you suggest a workaround?
Here is the code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs)
If Not Page.IsPostBack Then
bookFormView.ChangeMode(FormViewMode.ReadOnly)
Dim cancelButton As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton.Text = "Cancel"
End If
End Sub
Protected Sub bookFormView_ItemUpdated(ByVal sender As Object,
ByVal e As System.Web.UI.WebControls.FormViewUpdatedEventArgs ) Handles
bookFormView.ItemUpdated
Dim cancelButton1 As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton1.Text = "Done"
End Sub
The line of code where the error occurs is cancelButton1.Text = "Done"
Thanks in advance.
-- NedFollowup: In researching this I came across a comment that only the
controls in the current mode are accessible; if the formview is in edit
mode then only the controls in the <edititemtemplateare accessible,
if in read-only mode then only the controls in the <itemtemplateare
accessible. This might explain this except that an update is supposed
to automatically return the formview to read-only mode, right? Or does
that happen later (after the formview_itemupdated() has terminated)?
So I tried explicitly changing the mode to read-only within the
itemupdated subroutine, but I still get the same error.
Hope someone can relieve my frustration.
-- Ned
Ned Balzer wrote:
Quote: Originally Posted by Can anyone explain why in the following code, where btnCancel1 is a
Button inside the itemTemplate of the formview, the first call to
change the text of the button, in the Page_Load sub, works fine, but
the second call, in the bookFormView_ItemUpdated sub, throws an
exception (Object reference not set to an instance of an object)? And
if you know why, can you suggest a workaround?
>
Here is the code:
>
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs)
If Not Page.IsPostBack Then
bookFormView.ChangeMode(FormViewMode.ReadOnly)
Dim cancelButton As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton.Text = "Cancel"
End If
End Sub
>
Protected Sub bookFormView_ItemUpdated(ByVal sender As Object,
ByVal e As System.Web.UI.WebControls.FormViewUpdatedEventArgs ) Handles
bookFormView.ItemUpdated
Dim cancelButton1 As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton1.Text = "Done"
End Sub
>
>
>
The line of code where the error occurs is cancelButton1.Text = "Done"
>
Thanks in advance.
>
-- Ned |
1) Why not just use the control's variable? If the control has an id of
btnCancel1 and it's marked runat="server", then just do btnCancel1.Text =
"Done"
2) Are you using master pages? Control ID's change when placed into a
content placeholder on a master page. Use the DevToolBar to explore the DOM
and determine what your control's ID actually is on the client size.
"Ned Balzer" wrote:
Quote: Originally Posted by Can anyone explain why in the following code, where btnCancel1 is a
Button inside the itemTemplate of the formview, the first call to
change the text of the button, in the Page_Load sub, works fine, but
the second call, in the bookFormView_ItemUpdated sub, throws an
exception (Object reference not set to an instance of an object)? And
if you know why, can you suggest a workaround?
>
Here is the code:
>
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs)
If Not Page.IsPostBack Then
bookFormView.ChangeMode(FormViewMode.ReadOnly)
Dim cancelButton As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton.Text = "Cancel"
End If
End Sub
>
Protected Sub bookFormView_ItemUpdated(ByVal sender As Object,
ByVal e As System.Web.UI.WebControls.FormViewUpdatedEventArgs ) Handles
bookFormView.ItemUpdated
Dim cancelButton1 As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton1.Text = "Done"
End Sub
>
>
>
The line of code where the error occurs is cancelButton1.Text = "Done"
>
Thanks in advance.
>
-- Ned
>
> |
1) When I try that, I get an error in Visual Web Developer 2005: "Name
'btnCancel1' is not declared." It is marked runat="server" but I think
the problem arises because it is buried within the formview, so it's
not a normal button control.
2) No, I am not currently using master pages.
-- Ned
William Sullivan wrote:
Quote: Originally Posted by 1) Why not just use the control's variable? If the control has an id of
btnCancel1 and it's marked runat="server", then just do btnCancel1.Text =
"Done"
>
2) Are you using master pages? Control ID's change when placed into a
content placeholder on a master page. Use the DevToolBar to explore the DOM
and determine what your control's ID actually is on the client size.
>
"Ned Balzer" wrote:
> |
Quote: Originally Posted by Can anyone explain why in the following code, where btnCancel1 is a
Button inside the itemTemplate of the formview, the first call to
change the text of the button, in the Page_Load sub, works fine, but
the second call, in the bookFormView_ItemUpdated sub, throws an
exception (Object reference not set to an instance of an object)? And
if you know why, can you suggest a workaround? Here is the code: Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs)
If Not Page.IsPostBack Then
bookFormView.ChangeMode(FormViewMode.ReadOnly)
Dim cancelButton As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton.Text = "Cancel"
End If
End Sub Protected Sub bookFormView_ItemUpdated(ByVal sender As Object,
ByVal e As System.Web.UI.WebControls.FormViewUpdatedEventArgs ) Handles
bookFormView.ItemUpdated
Dim cancelButton1 As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton1.Text = "Done"
End Sub The line of code where the error occurs is cancelButton1.Text = "Done" Thanks in advance. -- Ned |
Well, it doesn't make sense to me, but I found the suggestion somewhere
and tried it: calling bookformview.databind() before attempting to
reference the object, and the error went away. Problem is, the button
text is not being changed either.
Hmmmmmm
Ned Balzer wrote:
Quote: Originally Posted by 1) When I try that, I get an error in Visual Web Developer 2005: "Name
'btnCancel1' is not declared." It is marked runat="server" but I think
the problem arises because it is buried within the formview, so it's
not a normal button control.
>
2) No, I am not currently using master pages.
>
-- Ned
>
William Sullivan wrote: |
Quote: Originally Posted by 1) Why not just use the control's variable? If the control has an id of
btnCancel1 and it's marked runat="server", then just do btnCancel1.Text =
"Done" 2) Are you using master pages? Control ID's change when placed into a
content placeholder on a master page. Use the DevToolBar to explore the DOM
and determine what your control's ID actually is on the client size. "Ned Balzer" wrote:
|
Quote: Originally Posted by Can anyone explain why in the following code, where btnCancel1 is a
Button inside the itemTemplate of the formview, the first call to
change the text of the button, in the Page_Load sub, works fine, but
the second call, in the bookFormView_ItemUpdated sub, throws an
exception (Object reference not set to an instance of an object)? And
if you know why, can you suggest a workaround?
>
Here is the code:
>
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs)
If Not Page.IsPostBack Then
bookFormView.ChangeMode(FormViewMode.ReadOnly)
Dim cancelButton As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton.Text = "Cancel"
End If
End Sub
>
Protected Sub bookFormView_ItemUpdated(ByVal sender As Object,
ByVal e As System.Web.UI.WebControls.FormViewUpdatedEventArgs ) Handles
bookFormView.ItemUpdated
Dim cancelButton1 As Button =
CType(bookFormView.FindControl("btnCancel1"), Button)
cancelButton1.Text = "Done"
End Sub
>
>
>
The line of code where the error occurs is cancelButton1.Text = "Done"
>
Thanks in advance.
>
-- Ned
>
> |
